Question

Is a compact metric space with a "doubled" point sequentially compact?

score 59 · Answer 1 · 2019-07-17 04:40:57

59

Views

Is a compact metric space with a "doubled" point sequentially compact?

Published on 17 Jul 2019 - 4:40

score 44 · Answer 2 · 2026-03-29 15:30:19

44

Views

Banach space operator

Published on 29 Mar 2026 - 15:30

score 144 · Answer 3 · 2026-03-26 06:31:14

144

Views

Is there any Hausdorff, $\sigma$-compact and nowhere locally compact space with every non dense open set not $\sigma$-compact?

Published on 26 Mar 2026 - 6:31

score 59 · Answer 4 · 2019-07-18 17:58:40

59

Views

Relatively compact substes of $\bar{\mathbb{R}}_+^2\setminus \{0\}$

Published on 18 Jul 2019 - 17:58

score 476 · Answer 5 · 2026-03-30 11:37:18

476

Views

Examples of spaces where the Sobolev spaces are relatively compact in

Published on 30 Mar 2026 - 11:37

score 186 · Answer 6 · 2026-03-26 17:36:20

186

Views

Alternative way to show that the special orthogonal group is compact

Published on 26 Mar 2026 - 17:36

score 291 · Answer 7 · 2026-03-30 06:15:33

291

Views

Connectedness of balls in a compact, connected metric space

Published on 30 Mar 2026 - 6:15

score 736 · Answer 8 · 2026-03-29 17:52:43

736

Views

Counterexample finite intersection property

Published on 29 Mar 2026 - 17:52

score 954 · Answer 9 · 2019-07-22 23:20:40

954

Views

On the proof of the theorem of Mazur

Published on 22 Jul 2019 - 23:20

score 116 · Answer 10 · 2019-07-24 03:32:35

116

Views

Problem on the compactness of a subset of $\mathsf{M}_n(\mathbb{R})$

Published on 24 Jul 2019 - 3:32

score 60 · Answer 11 · 2026-03-29 16:54:26

60

Views

On Frechet differentiability

Published on 29 Mar 2026 - 16:54

score 73 · Answer 12 · 2019-07-24 16:55:26

73

Views

$A$ relatively compact $\iff$ $A$ is bounded and limit of supremum of $A$ goes to $0$

Published on 24 Jul 2019 - 16:55

score 326 · Answer 13 · 2019-07-24 23:44:44

326

Views

On Mazur's original proof of his theorem: in Banach spaces convex hulls of precompact sets are precompact.

Published on 24 Jul 2019 - 23:44

score 37 · Answer 14 · 2019-07-25 12:20:37

37

Views

Compactness and metric space

Published on 25 Jul 2019 - 12:20

score 359 · Answer 15 · 2026-03-25 15:57:33

359

Views

Why the extended complex plane $\mathbb{C_\infty} = \mathbb{C}\cup \{\infty\}$ is compact while $\mathbb{C}$ is not?

Published on 25 Mar 2026 - 15:57

List Question

Is a compact metric space with a "doubled" point sequentially compact?

Banach space operator

Is there any Hausdorff, $\sigma$-compact and nowhere locally compact space with every non dense open set not $\sigma$-compact?

Relatively compact substes of $\bar{\mathbb{R}}_+^2\setminus \{0\}$

Examples of spaces where the Sobolev spaces are relatively compact in

Alternative way to show that the special orthogonal group is compact

Connectedness of balls in a compact, connected metric space

Counterexample finite intersection property

On the proof of the theorem of Mazur

Problem on the compactness of a subset of $\mathsf{M}_n(\mathbb{R})$

On Frechet differentiability

$A$ relatively compact $\iff$ $A$ is bounded and limit of supremum of $A$ goes to $0$

On Mazur's original proof of his theorem: in Banach spaces convex hulls of precompact sets are precompact.

Compactness and metric space

Why the extended complex plane $\mathbb{C_\infty} = \mathbb{C}\cup \{\infty\}$ is compact while $\mathbb{C}$ is not?

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